docs: def destination_point(point, brng, dist):
      """
      Calculate a destination Point base on a base point and a distance
  
      Keyword arguments:
      pt   -- polygon geojson object
      brng -- an angle in degrees
      dist -- distance in Kilometer between destination and base point
  
      return destination point object
  
      """
      dist = float(dist) / 6371  # convert dist to angular distance in radians
      brng = number2radius(brng)
  
      lon1 = number2radius(point['coordinates'][0])
      lat1 = number2radius(point['coordinates'][1])
  
      lat2 = math.asin(math.sin(lat1) * math.cos(dist) +
                       math.cos(lat1) * math.sin(dist) * math.cos(brng))
      lon2 = lon1 + math.atan2(math.sin(brng) * math.sin(dist) *
                               math.cos(lat1), math.cos(dist) - math.sin(lat1) * math.sin(lat2))
      lon2 = (lon2 + 3 * math.pi) % (2 * math.pi) - math.pi  # normalise to -180 degree +180 degree
  
      return {'type': 'Point', 'coordinates': [number2degree(lon2), number2degree(lat2)]}